Smokeless Flares Smokeless flares incinerate flammable hazardous vent gas with the assistance of supplemental high-velocity air or steam to prevent the formation of soot or smoke. Excessive injection of air or steam reduces combustion efficiency, resulting in the release of hazardous VOC gases. Meanwhile, inadequate injection of air or steam results in the formation of undesirable soot and smoke. Although modern flares are designed for high flow rates associated with an emergency condition, they most commonly operate at high-turn-down, low-flow rates, making it challenging for the flare to operate at optimal combustion efficiency. Pilot Monitor Flammable vent gases are ignited by a pilot flame when released into the atmosphere by refineries, natural gas processing plants, and petrochemical plants. The proper incineration of these gases is a critical safety and environmental concern. Therefore, it is essential to confirm that the pilot is lit at all times. Monitoring via a thermocouple is common, however, failures frequently occur and replacements can require costly process shutdowns. Remote sensing IR technology (PM) is the superior alternative. Flame Intensity Monitors Williamson Flame Intensity Monitors (FI) are the single-wavelength sensors of choice for a variety of flare applications where the more sophisticated dual-wavelength flare products are not appropriate or are not required.

1. INFRARED PRODUCTS FOR MONITORING SMOKELESS
FLARES, PILOTS, AND FLAME INTENSITY
Hile Controls of Alabama | 800-536-0269 | www.hilealabama.com

2. 2
Smokeless Flare Monitor (FM)
Smokeless flares incinerate flammable hazardous vent gas with the assistance of
supplemental high-velocity air or steam to prevent the formation of soot or smoke.
Excessive injection of air or steam reduces combustion efficiency resulting in
the release of hazardous VOC gasses while inadequate injection of air or steam
results in the formation of undesirable soot and smoke. Although modern flares are
designed for high flow rates associated with an emergency condition, they most
commonly operate at high-turn-down, low-flow rates, making it challenging for the
flare to operate at optimal combustion efficiency.
High Performance FM Sensors
The Williamson Flare Monitor (FM) utilizes proven dual-wavelength
technologytomonitortheratioofcarbontoavailableoxygendeepwithin
the hot flare flame. This ratio value correlates to combustion efficiency
and is used to adjust the flow of air or steam to smokeless flares,
assuring smoke-free operation and maximum combustion efficiency.
• Assures smoke-free operation and maximum destruction of VOC
gasses
• One control setpoint for all hydrocarbon (H-C) vent gasses means
no on-site calibration
• Uninfluenced by flame size or position within the field of view
• Uninfluenced by flame composition for all H-C gasses
• Unaffected by stack configuration or presence of steam
• Includes extra measured parameter values for confirmation and
diagnostics
• May be grade-mounted for easy access
• Used for Manual or Automatic feedback to control steam or air flow
Model FM-17-EXP
Explosion Proof Housing
Model FM-17-N4
NEMA4X / IP65 Housing
Typical Configuration
Part Number Area Classification
FM-17-D-IM-N4 Non-Hazardous
FM-17-D-IM-EXP Hazardous
Smokeless Flare Monitor Specifications
Output Scale 0-2000, Dimensionless
Spectral
Response
Proprietary narrow wavebands monitor the balance of carbon and
oxygen within the flame
Optical Resolution D/17
Maximum Distance 1800 feet, 550 m
Response Time Adjustable 0.1 second to 24 seconds (1 second default setting)
Analog Outputs 4-20mA or 0-20mA output (max impedance 1000 ohms)
Alarms Sensor: One SPST Relay Alarm Output 2A@120 or 250 Vac
Digital Interface Bi-Directional RS485 and RS232 communications
Human Interface Built-in menu system with access to signal conditioning, programmable
outputs alarms
Measured
Parameters
Filtered signal, unfiltered signal, signal dilution, ambient temperature.
Input
Power
Stand-Alone Sensor: 24 Vdc (300mA); with optional Interface Module
or power supply: 90-260 Vac 50-60 Hz (0.13A)
Ambient
Temperature Limits
Sensor: -40 to 150°F / -40 to 65°C
Environmental
Rating
Sensor: NEMA4X, IP65 or optional EXP Explosion Proof housing
See page 6 Part Code D for description of housing
Dimensions
(L x W x H)
N4 Sensor: 16in x 7in x 8in (406mm x 178mm x 203mm)
EXP Sensor: 10.7in x 5.4in x 10in diameter (272mm x 137mm x
254mm diameter)
Weight N4 Sensor and Swivel Bracket: 7.8 lbs. (3.5 kg)
EXP Sensor and Swivel Bracket: 11.6 lbs. (5.3 kg) EXPSS: 25 lbs. (11.3 kg)
Certification Calibration certificate is standard with each sensor
CE: EMI/ RFI for heavy industry; LVD ( low voltage directive)
Warranty 2 years
Model FM-17-EXPSS
Explosion Proof
Stainless Steel Housing
SMOKELESS FLARE MONITOR
CombustionEfficiency
HighCE,NoSmoke
Increase Assist,
Eliminate Smoke
Reduce Assist,
Increase
Efficiency
FM Reading vs Flare Conditions
Model FM Reading
99%
Reduce Assist, Lower Costs
Excessive Assist
0-1200
Optimal
1200-1300
Smoke
1300-2000
100%
Non-Smoking Condition Smoking Condition
Hile Controls of Alabama | 800-536-0269 | www.hilealabama.com

3. 3
High Performance PM Sensors
The Williamson Pilot Monitor (PM) utilizes proven
dual-wavelength technology to sense the presence
of the small, distant pilot flame. This technology
allows the pilot monitor to view clearly through
severe weather conditions caused by fog, wind,
rain, snow and sleet.
• Self-regulating means no on-site calibration
• May be grade-mounted for easy access
• 30% greater sensitivity means
greater reliability
• Includes Signal Dilution output for
measurement validation and diagnostics
• Large viewing area for easy alignment
Model PM-35-EXP
Model PM-75-EXP
Explosion Proof Housing
Model PM-35-EXPSS
Model PM-75-EXPSS
Explosion Proof
Stainless Steel Housing
Model PM-35-N4
Model PM-75-N4
NEMA4X / IP65 Housing
Pilot Monitor (PM)
Flammable vent gasses are ignited by a pilot flame when released into the
atmosphere by refineries, natural gas processing plants, and petrochemical plants.
The proper incineration of these gasses is a critical safety and environmental
concern. Therefore, it is essential to confirm that the pilot is lit at all times.
Monitoring via a thermocouple is common, however failures frequently occur and
replacements can require costly process shutdowns. Remote sensing IR technology
(PM) is the superior alternative.
Pilot Monitor Specifications
Output Scale 0-100%
Spectral Response Proprietary narrow wavebands
Optical Resolution D/35 or D/75
Maximum Distance 2000 feet, 610 m
Response Time Adjustable 0.1 second to 24 seconds (1 second default setting)
Analog Outputs 4-20mA or 0-20mA output (max impedance 1000 ohms)
Alarms Sensor: One SPST Relay Alarm Output 2A@120 or 250 Vac
Digital Interface Bi-Directional RS485 and RS232 communications
Human
Interface
Built-in menu system with access to signal conditioning,
programmable outputs alarms
Measured Parameters Filtered signal, unfiltered signal, signal dilution, ambient temperature.
Input Power Stand-Alone Sensor: 24 Vdc (300mA);
with optional Interface Module or power supply: 90-260 Vac 50-60 Hz (0.13A)
Ambient
Temperature Limits
Sensor: -40 to 150°F / -40 to 65°C
Environmental Rating Sensor: NEMA4X, IP65 or optional EXP Explosion Proof housing
See page 6 Part Code D for description of housing
Dimensions
(L x W x H)
N4 Sensor: 16in x 7in x 8in (406mm x 178mm x 203mm)
EXP Sensor: 10.7in x 5.4in x 10in diameter (272mm x 137mm x 254mm diameter)
Weight N4 Sensor and Swivel Bracket: 7.8 lbs. (3.5 kg)
EXP Sensor and Swivel Bracket: 11.6 lbs. (5.3 kg) EXPSS: 25 lbs. (11.3 kg)
Certification Calibration certificate is standard with each sensor
CE: EMI/ RFI for heavy industry; LVD ( low voltage directive)
Warranty 2 years
Typical Configuration
Part Number Area Classification
PM-35-A-N4 Non-Hazardous
PM-35-A-EXP Hazardous
PILOT MONITOR Hile Controls of Alabama | 800-536-0269 | www.hilealabama.com

4. 4
High Performance FI Sensors
The Williamson Flame Intensity Monitor utilizes
single-wavelength technology and thoughtful
wavelength selection to sense the presence
and intensity of flames of all types. The FI class
sensors are ideal when viewing hydrogen,
ammonia, CO and other flames. This lower-cost
technology is also commonly used as a pilot
flame detector for ground flares and landfill flares
where the viewing distance is less than about
300 feet or 100 meters.
• Thoughtful wavelength selection for
maximum sensitivity
• Model FI2 is recommended for Hydrogen
and Ammonia, Model FI5 is recommended
for CO Flames
• Ideal as a Pilot Monitor for Ground Flares
and Landfill Flares
• Increased sensitivity compared to UV
flame detectors
• Adjustable Sensitivity for Optimum Performance
Model FI2-35-N4
Model FI2-100-N4
Model FI2-200-N4
Model FI5-40-N4
NEMA4X / IP65 Housing
Flame Intensity Monitor Specifications
Output Scale 0-1000, Dimensionless
Control Parameter 0-1000, Dimensionless
Spectral Response Proprietary narrow waveband monitoring flame intensity
Optical Resolution D/35, D/40, D/100, D/200
Maximum Distance Pilot Monitoring: 300 feet, 90 m, Flame Intensity Monitoring: 1200 feet, 365 m
Response Time Adjustable 0.1 second to 24 seconds (1 second default setting)
Analog Outputs 4-20mA or 0-20mA output (max impedance 1000 ohms)
Alarms Sensor: One SPST Relay Alarm Output 2A@120 or 250 Vac
Digital Interface Bi-Directional RS485 and RS232 communications
Human Interface Built-in menu system with access to signal conditioning, programmable
outputs and alarms
Measured Parameters Filtered signal, unfiltered signal, ambient temperature.
Input Power Stand-Alone Sensor: 24 Vdc (300mA)
With optional Interface Module or Power Supply: 90-260 Vac 50-60 Hz , (0.13A)
Ambient
Temperature Limits
Sensor: -40 to 150°F / -40 to 65°C
Environmental Rating Sensor: NEMA4X, IP65 or optional EXP Explosion Proof housing
See page 6 Part Code D for description of housing
Dimensions
(L x W x H)
N4 Sensor: 16in x 7in x 8in (406mm x 178mm x 203mm)
EXP Sensor: 10.7in x 5.4in x 10in diameter (272mm x 137mm x 254mm diameter)
Weight N4 Sensor and Swivel Bracket: 7.8 lbs. (3.5 kg)
EXP Sensor and Swivel Bracket: 11.6 lbs. (5.3 kg) EXPSS: 25 lbs. (11.3 kg)
Certification Calibration certificate is standard with each sensor
CE: EMI/ RFI for heavy industry; LVD (Low Voltage Directive)
Warranty 2 years
Flame Intensity Monitor (FI)
WilliamsonFlameIntensityMonitors(FI)arethesingle-wavelengthsensorsofchoice
foravarietyofflareapplicationswherethemoresophisticateddual-wavelengthflare
products are not appropriate or are not required. Products specifically designated for
flame intensity monitoring applications include:
Pilot Monitoring of Hydrogen, Ammonia or CO Flames
Pilot Monitoring of Ground Flares and Landfill Flares
Flame Intensity Monitoring
Model FI2-35-EXP
Model FI2-100-EXP
Model FI2-200-EXP
Explosion Proof Housing
Model FI2-35-EXPSS
Model FI2-100-EXPSS
Model FI2-200-EXPSS
Explosion Proof
Stainless Steel Housing
Typical Configuration
Part Number Flame Type Area Classification
FI2-35-D-IM-N4 Hydrogen and Ammonia Non-Hazardous
FI2-35-D-IM-EXP Hydrogen, Ammonia and H-C Hazardous
FI5-40-D-IM-N4 CO and H-C Non-Hazardous
FLAME INTENSITY Hile Controls of Alabama | 800-536-0269 | www.hilealabama.com

5. 5
The optional 1/4 DIN Interface Module (IM) includes an advanced human interface
and complete communications capability. The Interface Module is recommended for
improved ease of use, the ability to view multiple measured parameters at the same
time, and compatibility with ProView PC-based software. Because it communicates with
the sensor digitally, the Interface Module allows the operator to interact with the sensor
from a control room as if standing in front of the sensor in the field.
Sensors feature a variety of input, output, and alarm
options to enable advanced process monitoring and
control capabilities. Each sensor can be configured to
operate as a four- or a six-wire stand-alone transmitter.
When using the remote Interface Module (IM), a six-wire
cable is required. Williamson recommends the six-wire
Belden Cable #83606 or equivalent. Each sensor includes
through-the-lens aiming, a built-in human interface and
3/4” NPT conduit connections.
Easy to Install, Operate and Maintain
Interface Configurations
Analog
Four or Six-Wire
Transmitter
• Power 24 Vdc, 300 mA
• One Analog Signal
• One Relay Alarm
Digital
Six-Wire
Stand-Alone
• Power 24 Vdc, 300 mA
• Four Measured Parameters via
RS485 Digital Communications
Six-Wire
with IM
• Power 90-260 Vac (0.13A)
• Two Analog Signals
• Two Relay Alarms
• One TTL Alarm
• Four Measured Parameters via RS232
and RS485 Digital Communications
Interface Module (IM) Explosion Proof Interface Module (IM-EXP)
NEMA4X (N4)
Explosion Proof (EXP EXPSS)
Hile Controls of Alabama | 800-536-0269 | www.hilealabama.com

6. WILLIAMSON CORPORATION
70 Domino Drive, Concord, Massachusetts 01742
TEL: +1-978-369-9607 • FAX: +1-978-369-5485
sales@williamsonir.com • www.williamsonir.com
A - Sensor Model B - Analog or Digital C - Accessories D - Housing
­— — —
Select the part numbers from the table to
configure a sensor for your application.
Contact Williamson for custom options.
Sample Part Number: FM-17-D-IM-EXP
Part Code D – Housing
Part No. Description
N4 Corrosion Resistant, Epoxy Powder Coated Cast Aluminum Enclosure
with NEMA4X (IP65) Rating
EXP Corrosion Resistant, Epoxy Powder Coated Cast Aluminum Enclosure with
NEMA7/9 (IP66), Class I, Division I, Groups B, C, D and Class II Division I,
Groups E, F, G, NEMA4X; ATEX, IECEx, FM, UL/cUL Ratings
EXPSS Corrosion Resistant, Cast 316 Stainless Steel Enclosure
Same ratings as EXP
Part Code B – Analog or Digital
Part No. Description
A • Stand Alone Sensor with built in display
• 4-20mA or 0-20mA output (1000 ohm impedance max.)
• SPST relay rated 2A@120 or 250 Vac
• Input power of 24 Vdc (300mA)
D • Bi-Directional RS485 communication
• This configuration used with IM
Part Code A ­‑ Sensor Model
Sensor Model Output Scale Field of View Description
Flare Monitor (FM)
FM-17 0 - 2000 17:1 Optics Standard
Pilot Monitor (PM)
PM-35 0 - 100% 35:1 Optics Standard
PM-75 0 - 100% 75:1 Optics Configuration for closely spaced flares
Flame Intensity Monitor (FI)
FI2-35 0 - 1000 35:1 Optics Configuration for Hydrogen, Ammonia, H-C flares
FI2-100 0 - 1000 100:1 Optics Configuration for closely spaced flares
FI2-200 0 - 1000 200:1 Optics Configuration for distant or closely spaced flares
FI5-40 0 - 1000 40:1 Optics
Configuration best for CO and H-C flares
Not available in Explosion Proof Housing (EXP)
Part Code C –Accessories
Part No. Description
PSD • DIN Rail Mount Power Supply: 90-260 Vac 50-60 Hz to 24 Vdc (600mA)
PSN4
• Power Supply for Non-Hazardous Area Classification:
90-260 Vac 50-60 Hz to 24 Vdc (600mA)
• Weight: 5.5 lbs. (2.5kg)
• Dimensions: 6.5in x 6.5in x 4.5in (165mm x 165mm x 114mm)
PSEXP
• Hazardous Area Power Supply: 90-260 Vac 50-60 Hz to 24 Vdc (600mA)
• Weight: 6 lbs. (2.7kg)
• Dimensions: 5.5in x 5.5in x 7.2in (139mm x 140mm x 182mm)
IM • Remote Interface Module with LED LCD Displays, two analog
outputs and two SPDT relays rated 2A@120 or 250 Vac
• Power Supply: 90-260 Vac 50-60 Hz (0.13A)
• Ambient Limit: 0 to 120°F / -17 to 50°C
• Weight: 2 lbs. (0.9 kg)
• 1/4 DIN Dimensions: 7.0in x 3.78in x 3.78in (178mm x 96mm x 96mm)
IMN4 • Weight: 7 lbs. (3.2kg)
• Dimensions: 8in x 10in x 6in (203mm x 254mm x 152mm)
See Part Code D - N4 for description of housing
IMEXP • Weight: 20 lbs. (9.1kg)
• Dimensions: 13.4in x 11.4in x 6.3in (340mm x 290mm x 160mm)
See Part Code D - EXP for description of housing
Explosion Proof Certifications
Product Type ATEX IECEx
Flare
Products II 2 G Ex db IIB+H2 T6 Gb IP66 Ex db IIB+H2 T6 Gb
Power
Supplies II 2 G Ex db IIC T6 Gb IP66 Ex db IIC T6 Gb
Interface
Modules II 2 G Ex db llB +H2 T6 Gb IP66 Ex db IIB T6 Gb
FM 3.18
Part Number Selection Guide Hile Controls of Alabama | 800-536-0269 | www.hilealabama.com